Clamp



(No Model.) 7

' A. W. DAVIS.

, CLAMP. No. 286,688. Patented Oct. 16,1883. 1

i i- A UNITED STATES PATENT OFFICE,

ARTHUR \V. DAVIS, OF ELMIRA, NEN YORK.

CLAMP.

SPECIFICATION forming part of,Letters Patent No. 286,688, dated October 16, 1883.

Application filed March 24, 1883.

To all'whom it may concern:

Be it known that I, ARTHUR XV. DAVIS, of Elmira, in the county of Chemung, in the State of New York, have invented new and useful Improvements in Clamps, of which the following, taken in connection with the accompanying drawings, is a full, clear, and ex act description.

This invention relates to a clamp designed to afford the utmost facility of adjustment to its work, and to grip its work without danger of marring the same.

The invention consists in a novel construc tion and combination of the component parts of the clamp, as hereinafter fully described, and specifically set forth in the claims.

Referring to the annexed drawings, Figure 1 is a side view of my improved clamp, and Fig. 2 a longitudinal section of the same.

Like letters of reference denote like parts in both figures.

A represents the clamp-yoke, usually formed of cast-iron, and of proper shape and dimen sions to reach with its extremities over opposite sides ofthe article to be gripped or clamped, one of the extremities being provided with the usual bearing, a, by which the clamp takes hold of one side of the article to be clamped. The opposite extremity of the yoke I form with a sleeve, 6, which is in range with the bearing a. In said sleeve slides a tubular stem, 0, which is provided with a ratchet, 71, on the side facing the yoke, the interior of the sleeve I) being formed with a longitudinal groove, 91, for the passage of the ratchet h, the latter con stituting a spline or rib, which serves to prevent the stem 0 from turning.

111 a cavity in the yoke A, adjacent to the groove 02, is pivoted a dog, adapted to engage the ratchet 71, and held yieldingly in said engagement by a spring, o, pressing on the back of the dog, as illustrated in Fig. 2 of the drawings. through the yoke, and is formed into a suitable handle, to allow the operator to throw the dog out of engagement with the ratchet h. Inside of the stem 0 slides, longitudinally, the grippingbar (I, having the step or bearing 0 permanently fixed to the end which faces the bearing a of the yoke. The bar (Z is prevented from turning by means of a lug, a, projecting from the The free end of said dog protrudes (No model.)

side thereof and into a longitudinal slot, 15, in

the stem 0, thus holding the bearing 0 stationary when applying the clamp to the article to be gripped, and therefore obviating the danger of wearing or defacing the said article. Thegripping-bar (Z may be formed either of a metal tube screw-threaded internally or of a solid rod provided with a female threaded socket, f, at the end opposite that which carries the bearing 0. In said socket works a screw, 8, which is confined longitudinally to the stem 0 by a collar, 7, and athumb-pieee or handle, m, on the outer end of the screw, bearing, respectively, against opposite sides of a shoulder, 17, on the end of the stem 0.

The operation of my improved clamp is as follows: In applying the clamp to the article to be gripped, the foot or bearing a of the yoke A is placed against one side of the article. Then the bearing 6 of the gripping-bar d is set against the opposite side of said article by throwing the dog out of engagement with the ratchet 71 and pushing the thus released stem 0, with the gripping-bar (I, toward the article to be gripped. \Vhen this is effected, the dog is allowed to engage the ratchet h, and thus lock the stem 0 in its position. Then, by turning the thumb-piece or handle an, the screw 8 is caused to crowd the grippingbar toward the article interposed between the bearings c and a, and thereby tighten the clamp upon the said article. The clamp is removed with equal facility by turning the handle m in the oppo site direction, and, so soon as the bearing c is liberated from the article, throwing the dog 9 off the ratchet 71, and then withdrawing the stem 0.

Having described my invention, what I claim as new is 1. The improved clamp, consisting of the yokeA, provided with the bearing a and sleeve Z), the tubular stem 0, sliding in said sleeve, and adapted to be locked in its position, the gripping-bar (Z, sliding in the stem 0, and provided with the screw-threaded socket f, and the screw 8, confined longitudinally on the stem 0 and entering the socket f, all combined and operating substantially as set forth and shown.

2. The combination of. the yoke A, provided with the bearing a and sleeve b, the dog 9, the

tubular stem 0, provided with the ratchet h and shoulder i, the gripping-bar d, sliding in y threaded socket f, and the screws, provided I 5 with the collar 1 and. thumb-piece m, all constructed and combined substantially as and for the purpose set forth and shown.

In testimony whereof I have hereunto signed my name and aflixed my seal, in the presence 20 of two attesting witnesses, at Elmira, in the county of Chemung, in the State of New York, this 17th day of March, 1883.

ARTHUR W. DAVIS. [L. s.]

Witnesses:

R. W. DAVIS, F. G. HALL. 

